N-aralkyl-n-(acyloxyalkyl)-2, 2-dihaloalkanamides and their preparation



N-ARALKYL-N-(ACYLOXYALKYL)-2,2-DIHALO- ALKANAMIDES AND THEIR PREPARATION Alexander R. Surrey, Albany, N. Y., assignor to Sterling Drug Inc., New York, N. Y., a corporation of Delaware No Drawing. Application April 19, 1955 Serial No. 502,522

28 Claims. (Cl. 260-477) This invention relates to N-aralkyl-N (acyloxyalkyl)- 2,2-dihaloa1kanamides and to their preparation.

The N-aralkyl-N-(acyloxyalkyl) -2,2-dihaloalkanamides A of my invention have the general formula Y-O-Ae' Ar-X- where Ar is a member selected from the group consisting of (A) phenyl radicals having from one to three substituents selected from the group consisting of halo, lower alkoxy, lower alkyl, lower alkyhnercapto, lower alkylsulfonyl, nitro and di(lower alkyl)amino, and (B) naphthyl, biphenylyl, furyl, pyridyl and thienyl radicals; X is a lower alklene radical having one to four carbon atoms; Y is a lower alkylene radical having two to six carbon atoms and having its two free valence bonds on different carbon atoms; Ac is a carboxylic acyl group having from one to eight carbon atoms; and Ac is a 2,2-dihaloalkanoyl radical having two to four carbon atoms. These halogenated-alkanamides have valuable chemotherapeutic properties, for instance, amebacidal activity as evidenced by cure of hamsters infected with amebiasis.

Compounds analogous to the above, but where Ar is unsubstituted-phenyl are considerably less active than those where Ar is phenyl substituted as noted. On the other hand, while substituted-phenyl compounds are about as available as unsubstituted-phenyl compounds, for other ring systems, i. e., naphthyl, biphenylyl, furyl, pyridyl and thienyl, the substituted ring systems are relatively unavailable.

The substituents of the radical Ar as given above can be in any of the available positions of the Ar nucleus, and

where more than one substituent, they can be the same or different and can be in any of the various position combinations relative to each other.

tuents include chloro, bromo, iodo and fiuoro. The

lower alkoxy, lower alkyl, lower alkylmercapto and lower r' alkylsulfonyl substituents, and the lower alkyl radicals of said di(lower alkyl)amino substituent, have preferably one to six carbon atoms, including such substituents as: methoxy, ethoxy, methylenedioxy, ethylenedioxy, n-propoxy, isopropoxy, isobutoxy, n-amoxy, n-hexoxy, and the like, when lower alkoxy; methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, Z-butyl, n-arnyl, n-hexyl, and the like, when lower alkyl; methylmercapto, ethylmercapto, n-propylmercapto, isobutylmercapto, n-hexylmercapto, and the like, when lower alkylmercapto; methylsulfonyl, ethylsulfonyl, n-propylsulfonyl, isobutylsulfonyl, n-hexylsulfonyl, and the like, when lower alkylsulfonyl; and dimethylamino, ethyl-methylamino, diisobutylamino, di-nhexylamino, and the like, when di(lower alkyl)amino.

Preferred embodiments of my invention are those .N- aralkyl-N-(acyloxyalkyl). 2,2-dihaloalkanamides where Ar is a substituted-phenyl radical as described above.

2,874,182 Paiiemed Feb. 17, 1959 The lower alkylene radical X has one to four carbon atoms, and includes such examples as -oH,('3H(0HlCH,), cH,oHa(' H(0H:)

and the like.

The lower alkylene radical Y has two to six carbon atoms and has its two free valence bonds on difierent carbon atoms, and includes such examples as -CH CH CH( CH Cli I CHzCHaCH(CHa), -CHaCHCH2CHrCHa and the like. V

The carboxylic acyl group Ac has from one to eight carbon atoms, for instance, formyl, haloformyl, alkanoyl, haloalkanoyl, dihaloalkanoyl, trihaloalkanoyl, carboxy alkanoyl, di(lower alkyl)aminoalkanoyl, benzoyl, alkoxybenzoyl, carboxybenzoyl, carbalkoxybenzoyl, haloben zoyl, dihalobenzoyl, and trihalobenzoyl, and includes such examples as: acetyl (ethanoyl), butanoyl, 3-methylbutanoyl, hexanoyl, and the like, when alkanoyl; chloroacetyl, bromoacetyl, 3-iodopropanol, Z-fiuorobutanoyl, and the like, when haloalkanoyl; dichloroacetyl, 2,2-dibromopropanoyl, 2-chloro-3-brornobutanoyl, and the i like, when dihaloalkanoyl; tribromoacetyl, 2,2,3-trichloro- The halo substi- V propanoyl, 2,3,4-trichlorobutanoyl, 2,2-dibromo-6-chloro hexanoyl, and the like, when trihaloalkanoyl; carboxyethanoyl, 3-carboxypropanoyl, 2-carboxypropanoyl, 6- carboxyhexanoyl, and the like, when carboxyalkanoyl; diethyla'minoacetyl, Z-dimethylaminopropanoyl, 4 di-n propylaminobutanoyl, and the like, when di(lower alkyl)- aminoalkanoyl.

The 2,2-dihaloalkanoyl radical Ac has two to four carbon atoms, and includes such examples as dichloroacetyl (dichloroethanoyl), dibromoacetyl, 2,2-diiodopropanoyl, 2,2-dichloropropanoyl, 2,2-difluoropropanyl, 2,2-dichlorobutanoyl, 2-chloro-Z-bromopropanoyl, and the like. The two halo substituents can be the same or different.

The compounds of my invention were prepared by re acting an N-aralkyl-N-(hydroxyalkyl)-2,2-dihaloalkanamide having the formula Y-OH Ar-X-N with an acylating agent selected from the group consisting of those having the formulas Ac'-halogen, (Ac) O and formic acid, where Ar, X, Y, Ac and Ac have the meanings given above. When an acyl halide, Ac-halogen', was used, the halide halogen, i. e., the halo radical attached to the carbonyl function was preferably chloro, however, other halo radicals, i. e., bromo, iodo and fiuoro, also can be used.- Illustrations of my invention are: the preparation of N-(2,4-dichlorobenzyl)-N(2- acetoxyethyl) dichloroacetamide by reacting N-(2,4-d i chlorobenzyl) N (2.- hydroxyethyl) dichloroacetamide with acetic anhydride; the preparation of N-(2,4-dibromobenzyl) -N-[2-(dichloroacetoxy)ethyl] 2,2 dichloropropanamide by reacting N-(2,4dibromobenzyl)-N-(2-hydroxyethyl)-2,2-dichloropropanamide with dichloroacetyl chloride; and the preparation of N-(4-nitrophenethyl)- N-[2-(n-butanoy1)ethyl]-2;2-difiuorobutanamide by reacting N- 4-nitrophenethyl) -N-(2-hydroxyethyl -2,2-difiuorobutanamide with n-butanoyl chloride or n-butanoic anhydride. When a halogenated-alkanoic anhydride, (Ac') O, is used, the reaction can be carried out at room temperature or higher if necessary. When a halogenatedalkanoyl halide was used the reaction was carried out preferably below room temperature, with chilling if necessary.

The intermediate N-aralkyl-N-(hydroxya kyl)-2,2-dihaloalkanamideshaving the above formula were prepared by reacting an aralkylaminoalkanol of the formula, Ar-X 'NHY-OH, with a 2,2 dihaloalkanoylating agent selected from the group consisting of those having the formula Ac-halogen, Ac-O-(lower alkyl) and (Ac) O, where Ar, X, Y and Ac have the meanings given above. When a lower alkyl 2,2-dihaloalkanoate was used, the methyl or ethyl esters were'prefer'redbecause of their ease of preparation and ready availability, however, other lower alkyl esters are satisfactory for the purpose. When a 2,2-dihaloalkanoyl halide wasused, the halide halogen, i. e., the halo radical attached to the carbonyl function, was preferably chloro, however, the other halo radicals, i. e., bromo, iodo and fluoro also can be used. Illustrations of this preparation are: the preparation of N-(2,4- dichlorobenzyl) N a (2 hydroxyethyl)dichloroacetamide by reacting 2-(2,4-dichlorobenzylamino)ethanol with methyl dichloroacetate; the preparation of N-(2,4-dibromobenzyl) N (4 hydroxybutyl) 2,2 dichloropropanamide by reacting 4-(2,4-dibromobenzylamino)butanol with 2,2-dichloropropanoyl chloride; and the preparation of N-(4 nitrophenethyl) N (2 hydroxypropyl)-2,2-difluorobutanamide by reacting 1-(4-nitrophenethylamino)-2-propanol with 2,2-difluorobutanoic anhydride. When a lower alkyl 2,2-dihaloalkanoate was used, the reaction was facilitated by warming the reactants ona steam bath. When a 2,2-dihaloalkanoic anhydride is used, the reaction can be carried out at room temperature or higher if necessary. When a 2,2-dihaloalkanoyl halide was used, the reaction was carried out preferably below room temperature, with cooling if necessary. Some of the intermediate N-benzyl-N-(hydroxyalkyD-Z,2-dihalalkanamides are disclosed and claimed in my copending application Serial No. 329,447, filed January 2, 1953, now U. S. Patent 2,732,402.

The aralkylaminoalkanols of the formula were prepared preferably by one of two procedures: reaction of an aralkyl halide, Ar-X-halogen, with an alkan0l amine, H N-Y--OH; and, for compounds where X is CH reaction of an aldehyde, Ar-CHO, with an alkanolamine, H N-Y-OH, and subsequent catalytical hydrogenation ofthe resulting anil, Ar-CH=NYOH. Alternatively, a third method of preparing these aralkylaminoalkanols is the reaction of an aralkylamine, Ar-X-NH with a haloalkanol, halogen-Y-OH.

The following examples will further illustrate specific embodiments of the invention without, however, limiting it thereto.

EXAMPLE 1 A. Ardlkylaminoa lkanols As pointed out above these intermediate'compounds were prepared preferably by one of two procedures: the reaction of an aldehyde with an alkanolamine and catalytic hydrogenation of the resulting anilfor the preparation of compounds where X is CH ;-'and the reaction of an aralkyl halide with an alkanolamine. Illustrations of these procedures follow. N

2 (4 isopropylbenzylai'nino)ethan0l.--A mixture of 44.3 g. of 4-isopropylbenzaldehyde and 18.3 g. of ethanolamine was heated on a steam bath in vacuo for one hour. The mixture was dissolved in 125 ml. of hot ethanol and reduced catalytically with 0.5 g. of palladium chloride and 3.5 g. of charcoal at about two atmospheres of hydrogen. After the reduction had been completed, the catalyst was filtered off and the alcohol distilled under reduced pressure. The residue which solidified was recrystallized once from n-heptane and once from ether, yielding the product, 2-(4-isopropylbenzylamino)ethanol, M. P. 80.9-83.3 C. (corn).

Analysis.Calcd. for C H NO: C, 74.55; H, 10.12. Found: C, 74.53; H, 10.16.

2 (4 isopropylbenzylamino)ethanol hydrochloride melted at 129.4-1322" C. (corn) when recrystallized from ethanol-ether.

Analysis.Calcd. for C H NO.HCl: C, 62.74, H, 8.77; Cl, 15.44. Found: C, 63.00; H,-8.99; Cl, 15.62.

Other (substituted-phenyl)aminoethanols prepared by the above illustrated procedure are given in Table I.

TABLE I R -onl-Nn-ongonron Base, M. P Hydrochlo- C. (corr) ride M. P..

C. (corr.)

38-30 1122-11315 75.0-76.6 1343-13511 63.0-63.6 IDS-104.0 67-082 1342-1382 51.9-55 I ia-145.5 62.6-64.4 152-1526 7 4-OG4H9-n 62.8-03.8 1406-1475 Analyses for the compounds of Table I are given in Table IA.

TABLE IA Analyses (Bases) No. Formula Carbon Hydrogen Calcd. Found Calcd. Found 1 C HuNO; -6G. 52 66. 66 8. 28 8. 74 2 CuHwNO: 68. 85 69. 84 9. 15 9. 27 CnHuNOr 07. 67 67. 00 8. 78 9. 00 4 UrzHwNOz 68. 86 68. 9. 15 0. 10 GuHzaNOz 70.80 71. G6 0. 77 10. 20 CroHgNOa 01. 53 61. 60 (i. 72 7. 03 CraHzrNOr 69. 92 70. 73 9. 48 9. 23

The following (substituted-benzyl)aminoalkanols were prepared by the reaction of a 'substituted-benzyl halide with an alkanolamine.

2-(2,4-dichl0r0benzylamino)ethan0l.-78.2 g. of 2,4- dichlorobenzylchloride was added dropwise with stirring to g. of ethanolamine. After standing at room temperature overnight, the mixture was-basified with 20% sodium hydroxide solution and extracted with ether. Removal of the ether and recrystallization of the residue with n-heptane gave 56 g. of 2-(2,4-dichlorobenzylamino)ethanol, melting at 62-62.8 C. (corn).

Analysis.-Calcd. for C I-I CI NO: C1, 32.22. Found: Cl, 32.43.

Alternatively, this product was obtained directly in 'solid form by pouring the reaction mixture into a large volume of water and-stirring.

2 (2,4 dichlorobenzylamino)ethanol hydrochloride melted at 184.7186.7 C. (corr.).

Analysis.--'Calcd. for C H Cl N Ol-lCl: C, 42.12;-H, 4.70; Cl, 13.80. Found: C, 42.30; H, 4.66; Cl, 13.78.

. (3,4 diiodobenzylamino) ethanol,

Other (substituted-benzyl)aminoalkanols prepared by the above illustrated procedure for the preparation of 2-(2,4-dichlorobenzylamino)ethanol are given in Table Analyses for the compounds II. I

TABLE 11 -CHs-NHYOH Hydrochlo- No. R Y Base, B. P., C. ride, M. P.,

C. (com) 1 a, 141 01 omen. 145.9-148. 1 2 2-o1 omen, 135. 2-1351; 3 4-(1 CH2OH2 126-131 at 0.7 mm- 172. 7-173. 8 4 2, 4-111-01 01110111011. 150-155 at 0.5 mm. 5 3,4-(11-01 011,011,011, 155-172 at (Vi-0.8

e 2,4111-01 omcnwnn 152. 4-1512- of Table II are given in 3 ethyDdichloroacetamide, as follows: A solution of 4 g. of dichloroacetyl chloride in ml. of ethylene dichloride was added dropwise with stirring and cooling to a solution of 12 g. of 2-(3,4-dichlorobenzylamino)ethanol in 100 ml. of ethylene dichloride. The temperature was maintained below 24 0, preferably at about 0 to -'5 C. by cooling with an ice-salt bath. After the addition had been completed, the reaction mixture was allowed to warm up to room temperature with stirring. The 2-(3,4- dichlorobenzylamino)ethanol hydrochloride which separated was removed by filtration and the filtrate was washed with 1 N hydrochloric acid, then water, and dried over anhydrous calcium sulfate. After distilling the ethylene dichloride under reduced pressure, the residue was triturated with ether to give 5.5 g. of the product, N-(3,4- dichlorobenzyl) N (2 hydroxyethyl)dichloroacetamide, M. P. 99.4-l0l.5 C. (corn) when recrystallized from a benzene-n-pentane mixture.

Analysis.--Calcd. for C H Cl NO Cl, 42.84; C, 9.89; H, 3.35. Found: Cl, 42.68; C, 39.70; H, 3.65.

Table IIA. When the above procedure is followed but using diiodo- TABLE HA Analyse: (Hydrochlorides) No. Formula Carbon Hydrogen Chloride Calcd. Found 0515a. Found 05155. round 0.151110121103111 42.13 42.26 4.71 4.54 13.82 12.93 CaHuOlNQHCl 43.68 411.511 5.90 6.07 15.97 15.76 OglimOlNQHGl lbiiitzrgigenz Calcd., 6.30; I ound, 31.13.". 31.96 onnnouNo {Base -Nitrogen: 'Oaled 5.91;; Found, 6.00] CmHnChNO Base -Nitrogen: Oalcd., 5.99; Found, 6.11] CWHHCIZNO [Base-Nitrogen: Calcd., 5.99; Found, 5.95]

a Total chlorine. b nn"=1.56D0, nn"=l.5539.

Other aralkylaminoa'lkanols can be prepared according to the procedures given above using the appropriate aldehyde or aralkyl halide and alkanolamine; such compounds include 2-(2,4-dibromobenzylamino) ethanol, 2- 2 (4 fluorophenethylamino)ethanol, 2 [4 (2,4 dichlorophenyl)- butylaminolethanol, 2 (2,4 dichlorophenethylamino)- ethanol, 2 (3,4,5 trichlorobenzylamino) ethanol, 2 (4 bromo 2 chlorobenzylamino)ethanol, 4 (2,4 difluorobenzylamino)butanol, 2 (4 n hexoxybenzylamino)ethanol, 2 (4; isobutoxybenzylamino) ethanol, 6 [2 (3,4,5 trimethoxyphenyl)ethylaminolhexanol, 2 (4 isobutylbenzylamino)ethanol, 2 (4 n amyl-- benzylamino)ethanol, 2 (4 n hexylbenzylamino)- ethanol, 6 (4 nitrobenzylamino)hexanol, 1 (4- nitrobenzylamino) 2 propanol, 3 (4- nitrobenzylamino)propanol, 2 (4 n butylmercaptobenzylamino)ethanol, 2 (4 n isobutylsulfony1benzy1- amino)ethanol, 1 (4 4 n"-'buty1benzyl'arnin'o) 2 propanol, 1 (4 diethylaminobenzylamino) 2 butanol, 3 (4 isopropylbenzylamino)propanol, .2 (1 naphthylmethylamino) ethanol, 2 (1 biphenylylmethylamino) ethanol, 2 (2 furylmethylam'ino) ethanol, 2 (2 thienylmethylarnino)ethanol, 2 (3 -pyridyl r'nethylamino)ethanol, and the like.

An illustration of an alternative method of preparing the intermediate aralkylaminoalkanols is the reaction of 2(3,4-dimethoxyphenyl) ethylamine with ethylene chlorohydrin to form 2-[2-(3,4-dimethoxyphenyl)ethylamino]- ethanol.

B. N -aralkyl-N hydroxyalkyl -2,2-dihaloalkanamides The preparation of these compounds is illustrated by the preparation of N-(3,4-dichlorobenzyl) N (2-hydroxy acetyl chloride, difluoroacetyl fluoride or bromochloro acetyl chloride, in place of dichloroacetyl chloride, the

TABLE III R /Y-OH C 0 CH(ha1ogen)1 No. R Y Halogen M.P., C

- corr CH2CH2 Cl 112. 4-113. 4 CHzGHz Cl 94. 4-912 CHzCHr G1 76. 9-79. 1 01120117 Cl 84. 5-85. 5 CH2CH7 Cl 101. 9-103. 4 CHzCH-r Cl 132, 2-133. 6 OHQCIIZ 01 88-88. 9 CHzCHz Br 115. 0-117. 2 CH2OH(CH3) Cl 135. 1-138 3,4-dl-Cl CII1CH(CH5) Cl 120. 0-121. 8 2 Cl CH2OH2 Cl 76. 6-79. 3 CHgCHgC H ("1 91. 9-97. 5 CHzCHaCH: Cl 83. 7-86. 7 GHZCHE B1 115. 15-128. 8 011 0111 Cl 116. 6-117. 7

Analyses for the compounds of Table III are given in Table IIIA.

TABLE IIIA Analyses N Formula" Carbon' Hydrogen" Chlorine Calcd. Found Oalcd. Found Calcd. Found 39. 3'9 40. 3. 3. 70 42. 84 42 95 44. 54 44.63 p 4. 07 4. 30 35.87 25. 82 50. 99 51. 26 5. 5. 66 23. 16 23. 18' 55. 27 55. 17 6. 30 6. 49 23.31 23. 07 47. 08 47. 09 4. 28 4. 39 23. 17 22.89 43. 02 43. 22 3. 91 4. 15 23. 00 23. 01 F3. 90 53. 57 6. b3 6. 44 21. 22 21. 47 31. 46 31. 43 2. 64 2. 85 38.07 a 37. 75 41. 77 41. 56 3. 80 3. 97 41. 10 40. 66- 41. 77 42. O0 3. 80 3. 86 20. 55 b 20. 52 I 44. 54 44. 41 4. 07 4. 32 h 23. 93 b 23. 96 41.77 41.70 3. 8O 3. 89 41. 10 41. 44 41. 77 41. 6') 3. 80 3. 88 41. 10 41. 23 31. 46 31. 54 2. 64 2. 41 I 38. 07 I 38. 3 9

C1sH11Cl'zNO4 48'. 45 48. 54 5. 32 5. 16 22. 01 22. 14

Bromine; Rcadil'y lfydroly'z'tihlc chlorine.

Other N-aralkyl-N-(hydroxyalkyl)-2,2-dihaloalkanamides that can be prepared according to the above procedure include: N- 2,4-dibromobenzyl -N- 2-hydroxyethyl) dibromoacetamide, N- 3 ,4-diiodobenzyl -N- 2-hydroxyethyl bromochloroacetamide, N 2- 4-fluorophenyl) ethyl] -N- Z-hydroxyethyl) difluoroacetamide, N- [4- (2,4- dichlorophenyl)butyl] N (2-hydroxyethyl)dichloroacetamide, N-[2-(2,4-dichlorophenyl)ethyl] N (2-hydroxyethyl dichloroacetamide, N- 3 ,4,5 -trichlorobenzyl) N-(Z-hydroxyethyl)diiodoacetamide, N (4 bromo-Z- chlorobenzyl)-N-(2-hydr0xyethyl 2,2 dichloropropanamide, N- (2,4-difiuorobenzyl -N- 4-hydroxybutyl -2,2- diiodopropanamide, N-(4-n-hexoxybenzyl-N-(Z-hydroxyethyl)-2-bromo 2 chloropropanarnide, N-[2-(3,4,5-trimethoxyphenyl)ethyl] N (6-hydroxyhexyl)-2,2-dichlorobutanamide, N- 4-n-hexylbenzyl -N-( 2-hydroxyethyl 2,2-dichlorobutanamide, N-(4-nitrobenzyl) N (3-hydroxypropyl)dibromoacetamide, N-(4-n-butylmercaptobenzyl -N- (Z-hydroxyethyl dichloroacetamide, N- 4-isobutylsulfonylbenzyl) N (2-hydroxyethyl)dichloroacetamide, N-( 4-n-butylbenzyl -N- Z-hydrbxypropyl dichloroacetamide, N-(4'-diethylaminobenzyl)-N-(2-hydroxybutyl )dichloroacetarnide, N- 4-isopropylbenzyl -N-( 3- hydroxypropyl)dichloroacetamide, N l-naphthylmethyl) -N- 2-hydroxyethyl dichloroacetamide, N-( l-biphenylylmethyl) -N- 2-l1ydroxyethyl dichloroacetamide, N- (2-furylmethyl) N (Z-hydroxyethyl)dichloroacetamide; N-( 2-thienylmethyl) N (2-hydroxyethyl)dichlorod acetamide, N- 3-pyridy1methyl -N- 2-hydroxyethyl )dichloroacetamide, and the like.

C. N-Aralkyl-N-i(halogenated-(IcyIoxy)m'kyl] 2,2 dih'aloalkanamides The preparation of these compounds is illustrated by the preparation of N-(2,4-dichlorobenzyl)-N-(2-chloroacetoxyethyl)dichloroacetamide, as follows: 12 g. of pyracetamide and stirring was continued for twelve hours. A small quantity of water soluble material was filtered off and discarded. The benzene filtrate was evaporated in vacuo leaving a heavy oilymaterial, which was triturated I Analyses for the compounds of Table IV are given in Table IVA.

TABLE IVA- Analysis No Formula Carbon Hydrogen Chlorine Calcd. Found Calcd. Found Calcd. Found QHHUCIHNOJ 39.89 40. 07 3.55 3.18 25.23 25. 35 2.. ownuohmot [Nitrogenf Gated, 7.31; Found, 7.10] 27. 72 27.20 3 OHHHCIQNO: 35; 32 35:22 2. 51 2. 76. 32. 09 31. 4..- CwHwChNIQ; 46.30 46. 52 4.61 4.57 34.16 33; 70 5. CflHziChNOi 45; 85 45. 74 4. 75' 4. 82 31. 86 32100 G. CnHmClvNOt 32. 79 32. 80 2. 11 2. O6 52. 11 62. 0t)

idine was added dropwise with stirring and cooling to e. Other N-aralkyl-N-'[(acyloxy)alky1]-2,2-diha1oalkansolution of 17 g. of chloroacetyl chloride in 300 ml. of benzene. To the resultant slurry was added 33.1 g.

amides that canv be prepared. according to the foregoing procedurensing the appropriate reactants include:

of N-(2,4-dichlorobenzyl)-N-(2-hydroxyethyl)dichloro- 7.5 N-(2,4-dibromobenzyl) N (2-bromoacetoxyethyl)dibromoaeetamide, N- (4-11'hexoxybenzy1 N (2-iodoacetoXyethyl)-2-bromo 2 chloropropanamide, N-[2-(3,4,5- trimethoxyphenyl)ethyl] N (d-diiodoacetoxyhexyl} 2,2-dichlorobutanamide, N- (4.-n-hexylbenzyl -N- [21- (3- iodopropanoyloxy)ethyl]-2,2-dichlorobutanamide, -N-(4- 5' acetamide, N [2 (4 fluorophenyl)ethyl] N [2- nitroben'zyl) N [3-(2,2-dichloropropanoyloxy)pro (butanoyloxy)ethylldifluoroacetamide, N (3,4,5 tripylldibromoacctamide, N-(4-isobutylsulfonylbenzyl)-N= chlorobenzyl) N [2 (3 methylbutanoyloxy)ethyl] [2-(2,3,4 trichlorobutanoyloxy)ethylldichloroacetamdiiodoacetamide, N (4 bromo 2 chlorobenzyl) N- ide, N-(4-diethylaminobenzyl) N [2-(2,2,3-trichloro- [2 (hexanoyloxy)ethyl] 2,2 dichloropropanamide,. butanoyloxy)butylldichloroacetamide, N-(4-isopropyl- N (2,4- difiuorobenzyl) N (4 acetoxybutyl) 2,2- benzyl) N [3-(2,2-dihromo-6-chlorohexanoyloxy)prodiiodopropanamide, N (4 n amyl-benzyl) N (2- pylldichloroacetamide, N-(l-biphenylylmethyl) -N- (2- acetoxyethyl) 2,2 --dichlorobutanamide, N (4 nchloroacetoxyethyl)dichloroacetamide, N (2 thienyl- 'butylrnercaptobenzyl) N (propanoyloxyethyl)dichloromethyl) N (2-dichloroacetoxyethyl)dichloroacetamacetamide, N (4 n butylbenzyl) N e 2 (2,2 diide, and the like. e methylpropanoyloxy)propyl]dichloracetamide, N (1- naphthylmethyl) N (2 'acetoxyethyl)dichloroacet- EXAMPLE 2 amide, N (2 furylrnethyl) N (2 acetoxyethyl)- N aralkyl N (acyloxyalkyl) 2,2 dihaloalkanamides d1ch1racetam 1de1 N (3 pyrldylmethyl) N acetoxyethyl)dichloroacetamide, and the like. The preparation of these compounds is illustrated by the following preparation of N (4 isopropylbenzyl)- EXAMPLE 3 N (2 n butanoyloxyethyl)dichloroacetamide: To a mixture of '12 g. of butanoic anhydride and 7.9 g. of pyridine was added 15.2 g. of N- (4 isopropylbenzyl)- N N (carboxyzlka'foyloxyalkyl) 212 7 N (2 hydroxyethyl) dichloroacetamide, whereupon some haloalkanamldes heat was evolved and solution resulted. The solution The preparation of these compounds is illustrated by was p a c temperature for w days and a the following preparation of N 2,4 '--dichl0robenzyl)- P u w1th-$t1mng mm a of W The solid N [2 (3 carboxypropanoyloxy)ethyl]dichloroaceta- PM? that sFPamted w collected alrdned and mide: To a mixture of 15 g. of succinic anhydride and crystalhud twlce from lsiopmpanol and Once f 12 g. of pyridine was added 33.1 g. of N (2,4 -dichl0rome n PentanfibThls i P Pg benzyl) N 2 hydroxyethyl)dichloroacetamide and benzyl N (2 utanoy oxye y 1c oleoacetaml the resulting mixture was heated for one hour on a steam minted 1 b 1h Th 11m 11 wed to ta d at r m tern .Anal ysisr-Calcd. for 0 11 01 140 c, 57.75; H, a 6 was a 0 S 6,73; Cl, "18.94. Found: C, 57.44; H, 6.45; Cl, 18.50.

N (4 7 isopropylbenzyl) N (2 butanoyloxyethyD- dih'loroacetamide can also be prepared using butanoyl chloride in place of butanoic anhydride.

Other N (substituted benzyl) N (acyloxyallryl)- 4 dichloroacet'amides prepared according to the above procedure are given in Table V.

amides that can be prepared according to the "foregoing;

procedure using the appropriate reactants include: N- (3,4 diiodobenzyl) N (2 acetoxyethyl)bromochloroperature for two days and then washed with dilute hydrochloric acid and water. The washed solution was extracted with ethylene dichloride, the extract dried over anhydrous calcium sulfate and the solvent removed by distilling in vacuo, leaving a heavy oily material that solidified after standing one week in a refrigerator. Three. recrystallizations of this solid material from ethanolwater yielded the product, N (2,4 dichlorobenzyl)- TABLE V N [2 (3 carboxypropanoyloxy)ethylldichloroacet- F 4 amide, M. P. 95.9-96.6 0. (com).

or1,-N Analysis.'Calcd. for C H C1 NO CI 1 5.45;

N. a, 431. Found:.Cl 1 .15; N. 12., 431.

No. R Y A0 'M.P.,G.

' (com) 1 2,4-d1-c1 CHzCHz 000111 74.0-76.0 2 2,4-111-01 01110111 cocmcmom 64.1-65.5 3 2,4-(11-01 CH7CH(OH3) 000111 oil 4. 3,4-dl-OCzH5 CHaCHr COG/Ha 72.5-14.4

' Analyses for the compounds of Table V are given in Table VA.

TABLE VA Analysis No. Formula Carbon Hydrogen Chlorine Calcd. Found Calcd. Found Caled. Found 1 o n 01 No 41.85 41.66 3.51 a09- 3s.02 38.28 i111..- CiZHiiCliNOi 44.91 44.73 4.27 3.87 17.68 17.84 3.... 0.111.501.1403 43.44 43.69 5.91 3.86 36.64 35.510 4 .CnHzsOlzNOs 52.05 51.88 5.91 5.67 18.08 17.80

Otlfer'N --(substituted benzyl) N -(acyloxyethyl)- diehloroacetamides ;prepared according to the abovepro= cedureare given in Table=VL TABLE .VI

R /CH;CH2O.CO(CH1)1-OOOH o CHCI:

No. R n M.P., O 0.

(corn) 2, 401-01 3 103. 4106.7 4-CH (CH1): 2 96. 7-100. 2 40OiH n 2 138. l-l39. 4

Analyses for the compounds of Table VI are given in Table VIA.

OtherN- aralkyl N (acyloxyalkyl) 2,2 dihaloalkanamides that catrbe prepared according to the foregoing procedure using .the. appropriate reactants include: N (3,4 dichlorobenzyl) N --[3 (2. carboxypropanoyloxyJpropyl]dibromoacetamide, N [2 (2,4 dichlorophenyl)ethyl]. N [2 carboxypentanoyloxy)- ethyndichloroacetamide, N (4 chlorobenzyl).- N [2- (2.- carboxypropanoyloxy)ethyl] 2,2 dichloropropanamide.

EXAMPLE 4 N aralkyl N (benzoxyalkyl) 2,2 dihaloalkanamides The preparation of these compounds is illustrated by the following preparation ofN (2,4 dichlorobenzyl)- N [2 (2,4 dichlorobenzoxy)ethylldichloroacetamide: 31.5' g. of 2,4 dichlorobenzoyl chloride was added with stirring and cooling (temperature to a solution of 24 g. of pyridine in 100 ml. of dioxane. Stirring of the resulting thick slurry was continued while a solution of 33.1 g. of N (2,4 dichlorobenzyl) N (2 hydroxyethyl)dichloroacetamide in 100 ml. of dioxane was added slowly. The resulting mixture was then refluxed for six hours. On cooling, the solid which separated was broken up, filtered off and discarded. The red filtrate was poured with stirring into two liters of water and stirring was continued until the oil that separated solidified. The pink solid was collected on a filter and oven-dried at 90 C., 49 g. (98%). After recrystallization once from benzene with charcoal and once from isopropanol, the product, N (2,4 dichlorobenzyl) N [2 (2,4 dichlorobenzoxy)ethyl]dichloroacetamide, melted at 113.8- 116 C. (corn).

1 2 A-nalysis.--Caled;' forc rr cnwog; c; 42.89;.H5- 2.60; 01 14.07; Found: c,- 42.57; H, 2171; c 13112;

When the above procedure wasfollowed using 2-carboxybenzoyl chloride in' place' of' 2,4-dichlorobenzoyl chloride, the resulting: product was N-(2,4-dichloro=- benzy1)N-[2 (2-carboxybenzoxy)ethyl]dichloroacetamide;

IVI. P. 1193-1229" C. (COIL). Analysis.--Calcd. for C19H15C14N05i CIKOH, N. 13., 479. Found: CI 14.54; N. a, 473:1.

Other N-aralkyl-N-(acyloxyalkyl)-2,2-dihaloalkanam ides that can be prepared according to the above'procedure' include:

chloropropanamide, N-(4-chlorobenzyl)-N-[2-(4-n-butoxybenzoxy)ethyl]dibromoacetamide, and the like.

EXAMPLE 5 N-(Substituted benzyl) -N-'(f0rmyl0xyalkyl)Y- 2,2-dihal0alkanamides The preparation of'formyloxy compounds, i. e., those" where Ac is is-special in-that formyl halides and formic anhydride are difficult to prepare if, indeed, they can be prepared:- at all. However, formic. acid can be used in their stead} as illustrated in the following paragraph.

A mixture of 33.1 g. of N-(2,4-dichlorobenzyl)-N- (Z-hydroxyethyl)dichloroacetamide and ml. of 'formic' acidwas heated on a steam bath for one hour with.

stirring and then poured into two liters of water with stirring. The product that separated was collected,

washed with water and recrystallized three. times from isopropanol. This product, N-'(2',4-dichlorobenzyl)-N (2-formyloxyethy1)dichloroacetamide, melted at 88.1- 90.6 C. (corn).

Analysis.Calcd. for C H Cl NO Cl, 40.14; H, 3.09; CI 19.55. Found: 01, 40.04; H, 3.05; CI 19.45.

Other N-(substituted-benzyl)-N-(formyloxyalkyl)-2,4-dihaloacetamides prepared according to the above procedure are given in Table VII.

Analyses for the compounds of Table VII are given in Table VIIA.

N- 3,4-dichlorobenzyl -N- [2- (4'-'carboxybenz= oxy) ethyl] dichloroacetamide, N- [2- (2,4-dichlorophenyl) 4 1 ethyl] N [2 (2 carbethoxybenzoxy)ethyl] 2,2-- difive hours. The precipitated diethylamine hydrochloride was filtered oil and the benzene filtrate was washed with water, dried and evaporated in vacuo yielding a viscous oily residue, which solidified when allowed to stand overnight in a refrigerator. Three recrystallizations of this solid from n-hexane yielded the product, N-(2,4-dichlorobenzyl) N (Z-diethylaminoacetoxyethyl)dichloro acetamide, M. P. 61.1-63.5 C. (corn).

Analysis.-Calcd. for C17H2 Cl4N2O I N, CIKOH, 15.96. Found: N, 6.30; Cl 16.05.

The N-aralkyl-N-(acyloxyalkyl)-2,2-dihaloalkanamides of the foregoing examples when administered orally in aqueous suspension to hamsters infected with Endamoeba criceti were found to completely clear the animals of the infection atdrug levels below 200 mg. per kg. of body weight.- Some of the compounds, for instance, N-(2,4-dichlorobenzyl) N (2 acetoxyethyl)dichloroacetamide, N (2,4 dichlorobenzyl) N [2 (n butanoyloxy) ethyl] dichloroacetamide, N- (2,4-dichlorobenzyl) -N-( 2-formyloxyethyl)dichloroacetamide, N-(2,4-dichlorobenzyl)- N- [2-( chloroacetoxy) ethyl] dichloroacetamide, N-(2,4-dichlorobenzyl)- N [2 -(3 chloropropanoyloxy)ethyl] dichloroacetamide, N-(2,4-dichlorobenzyl -N- [2- (dichloro- I acetoxy) ethyl] dichloroacetamide, N-(2,4-dichlorobenzyl)- N [2 (2,4 dichlorobenzoxy)ethylldichloroacetamide, N (4 isopropylbenzyl) N (2 dichloroacetoxyethyl)- dichloroacetamide, N-(4-isopropylbenzyl)-N-[2-(n-butanoyloxy)eth'yl]dichloroacetamide, N-(4-isopropylbenzyl) -N-(2-formyloxyethyl) dichloroacetamide and N-(4-nbutoxybenzyl) N (2 formyloxyethyl)dichloroacetamide, have ED values in the range between 3 and 15 mg. per kg. of body weight, ED meaning the efiective dose necessary to clear 50% of the hamsters of the amebic infection. Coupled with this outstandingly high activity, my compounds have a extremely low toxicities. For example, N-(2,4-dichlorobenzyl)-N-[2-(chloroacetoxy)- ethyl]dichloroacetamide, which has an ED value of 12.5 mg./kg., has an acute oral LD (mice; seven-day) of 30001400 mg./kg. and a subacute oral LD (rats; five-day) of 500x805 mg./kg.; and N-(2,4-dichlorobenzyl)-N- [2-(n-butanoyloxy) ethyl] dichloroacetamide, which has an ED value of 6.0 mg./kg., has an acute oral ALD (mice) of greater than 16,000 mg./kg. The N-aralkyl-N-(acyloxyalkyl)-2,2-dihaloalkanamides of my invention also can be administered in solid form,.e. g., as tablets or in capsules, and optionally admixed with conventional excipients such as starch, talc, and the like.

This application is a continuation-in-part of my copending application Serial Number 411,553, filed February 19, 1954, now abandoned.

I claim:

1. A compound having the formula where Ar is a member selected from the group consisting 1. 2,2-diha1oalkanoyl radical living two to four carbon atoms.

2. A compound having the formula (halogen) CHiCH:0Ae'

(halogen) COCH(halogen)r where Ac is a carboxylic acyl group having from one to eight carbon atoms.

3. A compound having the formula (lower alkyl) CH2CHz-OAO' CHa--N C O C H(halogen)i where Ac is a carboxylic acyl group having from one to eight carbon atoms.

4. A compound having the formula 000E015 where Ac is a carboxylic acyl group having from one to eight carbon atoms.

7. A compound having the formula where Ac is a carboxylic acyl group having from one to eight carbon atoms.

8. N (2,4 dichlorobenzyl) N (2 trichloroacetoxyethyl) dichloroacetamide.

9. N (2,4 dichlorobenzyl)v N (2 chloroacetoxyethyl)dichloroacetamide.

10. N (2,4 dichlorobenzyl) N [2 (3 chloropropanoyloxy) ethyl] dichloroacetamide.

11. N (2,4 dichlorobenzyl) N [2 (n butanoyloxy) ethyl] dichloroacetamide.

12. N (2,4 dichlorobenzyl) N [2 (2,4 dichlorobenzoxy) ethylldichloroacetamide.

13. N (2,4 dichlorob'enzyl) N (2 formyloxyethyl) dichloroacetamide.

14. N (4 isopropylbenzyl) N (2 J dichloroacetoxyethyl)dichloroacetamide.

15. N (4 isopropylbenzyl) N [2 (n butanoyloxy) ethyl] dichloroacetamide.

16. N (4 isopropylbenzyl) N (2 formyloxyethyl) dichloroacetamide.

17. N (4 n butoxybenzyl) N (2 formyloxyethyl) dichloroacetamide.

18. A process for the preparation of a compound having the formula Y-O-Ac' ArX--N where Ar is a member selected from the group consisting of (A) phenyl radicals having from one to three substituents selected from the group consisting of halo, lower alkoxy, lower alkyl, lower alkylmercapto, lower alkylsulfonyl, nitro and di(lower alky1)amino, and (B) naph thyl, biphenylyl, fury], pyridyl and thienyl radicals; X is a lower alkylene radical having one to four carbon atoms; Y is a lower alkylene radical having two to six carbon atoms and having its two free valence bonds on different carbon atoms; Ac is a carboxylic acyl group having from one to eight carbon atoms; and Ac is a 2,2-dihalo alkanoyl radical having two to four carbon atoms; which comprises reacting a compound having the formula with an acylating agent selected from the of Ac'-halogen, (Ac) O and formic acid. a

19. A process for the preparation of N-(2,4-dichlorobenzyl) N (2 trichloroacetoxyethyl)dichloroacetamide which comprises reacting N-(2,4-dichlorobenzyl)-N- (2-hydroxyethyl)dichloroacetamide with trichloroacetyl chloride.

20. A process for the preparation of N-(2,4-dichlro benzyl) N (2 chloroacetoxyethyl)dichloroacetamide which comprises reacting N-,(2,4-dichlorobenzyl)-N-(2- hydroxycthyl)dichloroacetamide with chloroacetyl chloride.

21. A process for the preparation of N-(2,4-dichlorobenzyl) N [2 (3 chloropropanoyloxy)ethyl] dichloroacctamide which comprises reacting N-(2,4-dichlorobenzyl)-N-(2-hydroxyethyl)dichloroacetamide with 3- chloropropanoyl chloride.

22. A process for the preparation of N-(2,4-dich1oro benzyl) N [2 (n butanoyxy)ethyl]dichloroacetamide which comprises reacting N-(2,4-dichlorobenzyl)-N- (Z-hydroxyethyl)dichloroacetamide with n-butanoic anhydride.

group consisting 23. A process for the preparation of N-(2,4-dichlorobenzyl) N [2 (2,4 dichlorobenzoxykthyl]dichloroacetamide which comprises reacting N-(2,4-dichlorobenzyl)-N-(2-hydroxyethyl)dichloroacetamide with 2,4-dichlorobenzoyl chloride.

24. A process for the preparation of N-(2,4-dic hlorobenz yl -N-( 2-formyloxyethyl) dichloroacetamide which comprises reacting N-(2,4-dichlor0benzyl)-N-(2-hydroxyethyl)dichloroacetamide with formic acid.

25. A process for the preparation of N-(4-isopropylbenzyl) N -'(2 dichloroacetoxyethyl) dichloroacetamidc which comprises reacting N-(4-isopropylbenzyl)-N-(2- hydroxyethyl)dichloroacetamide with dichloroacetyl chloride.

26. A process for the preparation of N-(4-isopropylbenzyl) N [2 (n butanoyloxy)ethylldichloroacetamide which comprises reacting N-(4-isopropylbenzyD-N- (2-hydroxyethyl)dichloroacetamide with n-butanoic anhydride.

27. A process for the preparation of N-(4isopropy1- benzyl)-N-(2-formyloxyethyl)dichloroacetamide which comprises reacting N-(4-isopropylbenzyl)-N-(2-hydroxyethyl)dichloroacetamide with formic acid.

28. A process for the preparation of N-(4-n-butoxybenzyl) -N-( Z-formyloxyethyl dichloroacctamide which comprises reacting N-(4-n-butoxybenzyl)-N-(2-hydroxyethyl)dichloroacetamide with formic acid.

References Cited in the file of this patent UNITED STATES PATENTS Hanford et a1 Feb. 18, 1941 Katzman Jilly 28, 1942 OTHER REFERENCES 

1. A COMPOUND HAVING THE FORMULA
 18. A PROCESS FOR THE PREPARATION OF A COMPOUND HAVING THE FORMULA 